Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-6.2-pull-request...
[qemu.git] / linux-user / signal-common.h
1 /*
2 * Emulation of Linux signals
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #ifndef SIGNAL_COMMON_H
21 #define SIGNAL_COMMON_H
22
23 int on_sig_stack(unsigned long sp);
24 int sas_ss_flags(unsigned long sp);
25 abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka);
26 void target_save_altstack(target_stack_t *uss, CPUArchState *env);
27 abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env);
28
29 static inline void target_sigemptyset(target_sigset_t *set)
30 {
31 memset(set, 0, sizeof(*set));
32 }
33
34 void host_to_target_sigset_internal(target_sigset_t *d,
35 const sigset_t *s);
36 void target_to_host_sigset_internal(sigset_t *d,
37 const target_sigset_t *s);
38 void tswap_siginfo(target_siginfo_t *tinfo,
39 const target_siginfo_t *info);
40 void set_sigmask(const sigset_t *set);
41 void force_sig(int sig);
42 void force_sigsegv(int oldsig);
43 #if defined(TARGET_ARCH_HAS_SETUP_FRAME)
44 void setup_frame(int sig, struct target_sigaction *ka,
45 target_sigset_t *set, CPUArchState *env);
46 #endif
47 void setup_rt_frame(int sig, struct target_sigaction *ka,
48 target_siginfo_t *info,
49 target_sigset_t *set, CPUArchState *env);
50
51 void process_pending_signals(CPUArchState *cpu_env);
52 void signal_init(void);
53 int queue_signal(CPUArchState *env, int sig, int si_type,
54 target_siginfo_t *info);
55 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
56 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
57 int target_to_host_signal(int sig);
58 int host_to_target_signal(int sig);
59 long do_sigreturn(CPUArchState *env);
60 long do_rt_sigreturn(CPUArchState *env);
61 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr,
62 CPUArchState *env);
63 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
64 abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx,
65 abi_ulong unew_ctx, abi_long ctx_size);
66 /**
67 * block_signals: block all signals while handling this guest syscall
68 *
69 * Block all signals, and arrange that the signal mask is returned to
70 * its correct value for the guest before we resume execution of guest code.
71 * If this function returns non-zero, then the caller should immediately
72 * return -TARGET_ERESTARTSYS to the main loop, which will take the pending
73 * signal and restart execution of the syscall.
74 * If block_signals() returns zero, then the caller can continue with
75 * emulation of the system call knowing that no signals can be taken
76 * (and therefore that no race conditions will result).
77 * This should only be called once, because if it is called a second time
78 * it will always return non-zero. (Think of it like a mutex that can't
79 * be recursively locked.)
80 * Signals will be unblocked again by process_pending_signals().
81 *
82 * Return value: non-zero if there was a pending signal, zero if not.
83 */
84 int block_signals(void); /* Returns non zero if signal pending */
85
86 #endif